# """
# This is the interface that allows for creating nested lists.
# You should not implement it, or speculate about its implementation
# """
# class NestedInteger(object):
#    def isInteger(self):
#        """
#        @return True if this NestedInteger holds a single integer, rather than a nested list.
#        :rtype bool
#        """
#
#    def getInteger(self):
#        """
#        @return the single integer that this NestedInteger holds, if it holds a single integer
#        Return None if this NestedInteger holds a nested list
#        :rtype int
#        """
#
#    def getList(self):
#        """
#        @return the nested list that this NestedInteger holds, if it holds a nested list
#        Return None if this NestedInteger holds a single integer
#        :rtype List[NestedInteger]
#        """

class Solution(object):
  def depthSum(self, nestedList):
    """
    :type nestedList: List[NestedInteger]
    :rtype: int
    """

    def helper(root, depth):
      res = 0
      for nested in root:
        if nested.isInteger():
          res += depth * nested.getInteger()
        else:
          res += helper(nested.getList(), depth + 1)
      return res

    return helper(nestedList, 1)
